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The Mercedes-Benz S-Class just keeps growing – both in terms of dimensions and in terms of variants. Nevermind the S-Class Coupe for a moment and focus only on the sedan: in North America alone, you can get the big Benz in S550, S600, S63 and S65 spec, and at the Los Angeles Auto Show this year, Daimler has rolled out the new Maybach version as well. But if it's a more environmentally friendly way to woosh around town in serene luxury that you're after, you'll want to look at the new S550

Judging by how long we waited to get a clear shot of the Mercedes-Benz S500 Plug-in Hybrid, you'd have thought hybrid cars were only driven by Terminators and that the technology arrived only 48 hours ago through a wormhole in the Mercedes stand. The newest member of the Mercedes-Benz S-Class hybrid band - joining the S400 Hybrid and S350 BlueTEC Hybrid, it hits notes like a 5.5-second sprint from standstill to 62 miles per hour, up to 19 miles of ion-powered running and uses three liters of gas

The third model in the lineup of Mercedes-Benz S-Class hybrids has arrived: the S500 Plug-in Hybrid brings with it a 0-to-62 mile-per-hour time of 5.5 seconds, 30 kilometers (nearly 19 miles) of electric-only operation and a fuel economy rating of three liters per 100 kilometers on the European cycle (78.41 mpg US, though that's not apples-to-apples). Those numbers outdo those of the second-generation S400 Hybrid and S350 BlueTEC Hybrid. In fact, that mpg figure is better than the Audi A3 1.6 TD